* Fix tests to use Ahem, and helpful changes around that

- Fix fonts that had metric-specific behaviours.

- LiveTestWidgetsFlutterBinding.allowAllFrames has been renamed
  to LiveTestWidgetsFlutterBinding.framePolicy.

- LiveTestWidgetsFlutterBinding now defaults to using a frame policy
  that pumps slightly more frames, to animate the pointer crosshairs.

- Added "flutter run --use-test-fonts" to enable Ahem on devices.

- Changed how idle() works to be more effective in live mode.

- Display the test name in live mode (unless ahem fonts are enabled).

- Added a toString to TextSelectionPoint.

- Style nit fixes.

* Roll engine to get Ahem changes.

* Update tests for dartdoc changes.

* Fix flutter_tools tests

Fixes https://github.com/flutter/flutter/issues/7715

This reverts commit ff23a1eb.

Our iOS lab hardware is back to normal.

Rename State.config to State.widget
Rename State.didUpdateConfig to State.didUpdateWidget
Renamed all State subclasses' local variables named config to something else

* do not warn about out-of-date Flutter installation too often

* style fix

Added a PluginRegistry to the new project template. The registry files will be automatically updated at build time to register the native plugins.

Fixes #7814.

* Wiring fullscreen dialog

* Make fullscreen dialog use the new API. Add tests

* Review notes

* Move field back up

* final

Came across "can ve" while experimenting with Forms using VSCode and Dart Code. Glanced over the rest of the docs for typos while I was at it.

Also, add a specific message for BuildContext.size for RenderSlivers.

* generate_from_arb has been moved to intl_translantion library

* fixed typo

* added missing intl dependency

* Regenerated language files with latest intl script

* Added version to intl_translations

* added isolate min version constraint

* upgrade to linter-0.1.30

* add prefer_is_empty lint
* add directives_ordering lint
* add no_adjacent_strings_in_list lint
* add no_duplicate_case_values lint
* add prefer_collection_literals lint
* add prefer_const_constructors lint
* add prefer_contains lint
* add prefer_initializing_formals lint
* add unnecessary_null_aware_assignments lint
* add unnecessary_null_in_if_null_operators lint

* fix checkLockAcquired: support re-entrant locking

* add test; address comments

* add comment

The stocks routing table is a clearer example of how to do this.
People know to look at the gallery, but don't think to look at the
stocks version. This points them from the former to the latter.

Nobody knew what a Block was.

Now the scale gesture will accept if its focal point moves more than the pan
slop. This change lets it compete with a drag gesture (e.g., a containing scrol
view) in the same way that the pan gesture does.

Fixes #8735

Gradle APK builds include engine binaries for all applicable architectures

Fixes https://github.com/flutter/flutter/issues/6849

Aggressively apply the const lint.

enterText() now includes a call to idle().

Fixes a bug where tapping in the text under edit moved the cursor but
did not push the updated selection to the engine.

Adds a test for caret position updates.

Pulls in latest 1.23. cherry picks, including @abarth’s fix to restrict `@immutable` checks to instance fields.

Fixes https://github.com/flutter/flutter/issues/9259

Fixes #9246